56 NEW YORK STATE MUSEUM 



area encountered here (page 26), together with the irregularity 

 of the sub-Potsdam surface (pages 6 and 14) ; he also pointed out 

 the distinction between the lower and upper portions of the " Pots- 

 dam " and the upward gradation of the latter into the " passage 

 beds " to the '' Calciferous " (page 13). While he noted some dis- 

 turbance of the strata, he ascribed it to the faulting with which he 

 had been familiar in the Champlain valley, applying this explana- 

 tion to the gneiss exposed at Potsdam village and the red sandstone 

 area at Hannawa Falls (pages 13, 14, 24). His statement (page 

 24) that the rocks along the Raquette from Potsdam to Norwood 

 "are all with the same dip [northwesterly], and manifestly in a 

 continuous and undisturbed section " shows that time limitations 

 prevented his seeing all the exposures, and must today be qualified. 



i8qq. The epochal nature of the times was signalized in two 

 other quarters. Through three different media Dr John M. Clarke 

 and Prof. Charles Schuchert wrought a revolution in the classifi- 

 cation and naming of the New York Paleozoic formations 

 (Science 10:874-78, December 15, 1899; Amer. Geol., 25:114-19, 

 February 1900 ; Memoir 3 of the New York State Museum : pages 

 8 to 12, 1900). For " Calciferous sandrock " of Eaton and Emmons 

 they propose the name Beekmantown limestone, and restore the 

 early names Taconic and Champlainic in place of Cambrian and 

 Ordovician. In the following year (1901) Director Merrill of 

 the Museum put out the present standard " Geologic Map of New 

 Yor'k State " on the same scale as the McGee map of 1894, which 

 it was intended to replace. For our area Cushing's boundaries and 

 unpublished work by Smyth were used. This represents the last 

 mapping done on the Canton district until Doctor Martin and the 

 writer entered the field. 



1(^01. In directions other than mapping much, however, has been 

 accomplished in the past sixteen years. In the 19th Report of the 

 Geologist, pages r98 to ri03 (1901) Smyth described minutely the 

 character of the Potsdam sandstones and of the surface on which 

 they were laid down, in the Thousand Islands region; and in the 

 20th report page r37 (1902) the existence of the Adirondack pene- 

 plain is suggested by Gushing for our county. The character of the 

 Potsdam invasion is discussed by Dr E. O. Ulrich and Professor 

 Schuchert in Museum Bulletin 52, pages 636-37 (1902). In- Bul- 

 letin 56 of the same year, Merrill describes the new state map (of 

 1901), reviewing in a table the classifications of our rocks from 

 1823 to date. Walcott in 1903 (Journal of Geology, 11:318) pro- 

 posed Saratogan (" Saratogian ") to replace Potsdamian for the 



